Second Hand Mercedes-Benz CLA Fuse Box

The Mercedes-Benz CLA ran across two distinct generations: the first-generation C117 (2013–2019, with a facelift around 2016) and the second-generation C118 (2019 onwards). Fuse boxes are generation-specific, so a C117 unit will not interchange with a C118 car, and you should always match the part to the correct generation. Within the same generation, fitment is more likely but can still vary by build date and specification, so confirm with the breaker against your exact registration to be sure.

The first-generation CLA (C117) received a facelift in 2016, and while the body shell is the same generation, the facelift brought electrical updates that can affect fuse box specification. Crossing that 2016 boundary is therefore uncertain, and you should ask the breaker to check the part number against your registration rather than assume it will simply plug in. Do not assume pre- and post-facelift units are identical.

Trim level — whether your CLA is an SE, Sport, AMG Line, or AMG — does not fundamentally change the fuse box in the way that generation or build date does. That said, certain higher-specification cars may have additional modules or circuits for optional equipment such as sunroofs or advanced driver aids, which could mean a fuse box from a lower-spec car is missing circuits you need. It is worth telling the breaker your exact trim and any optional extras so they can match the specification as closely as possible.

Mercedes-Benz does share electrical architecture across models built on the same platform, and some components can cross over, but fuse box compatibility is highly build-specific and not something to assume without verification. The CLA shares its MFA2 platform with models like the A-Class (W177) in the second generation, but differences in fitted options and software can make cross-model swaps unreliable. Always confirm with the breaker against your full registration before purchasing.

Yes — the CLA, like most modern Mercedes-Benz vehicles, has more than one fuse and relay box; there is typically a main fuse box in the engine bay and a further unit inside the cabin, sometimes referred to as the SAM (Signal Acquisition Module) unit, which controls a wide range of electrical functions. If you are replacing a faulty unit, it is important to identify which fuse box you actually need, as the SAM in particular may require coding to your vehicle after fitting. Let the breaker know which location yours is from so they can supply the correct unit.

Yes, the build year matters because Mercedes-Benz updates electrical specifications during a model's production run, meaning a fuse box from an early 2013 CLA may differ from one built in 2018 even though both are first-generation C117 cars. The safest approach is to give the breaker your registration so they can match the part number precisely rather than relying on year alone. Build month can also matter on cars produced close to a specification change, so the more information you can provide, the better.